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" ... But amongst birds, parrots are special. Parrots do not depend on their diet for color pigments. Along with penguins, turacos and bustards, parrots are amongst a very few birds that we know of that biochemically manufacture their own colorful plumage pigments. In parrots, these molecules are chromophores known as “psittacofulvins” because parrots are the only animals that make them. ... "